chore: auto-fix Biome formatting and configure lint rules

Run biome check --write --unsafe to fix tabs, import ordering, and
non-null assertions across entire codebase. Disable a11y rules not
applicable to this single-user app. Exclude auto-generated routeTree.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/client/components/ThreadTabs.tsx

@@ -1,33 +1,33 @@
 interface ThreadTabsProps {
-  active: "gear" | "planning";
-  onChange: (tab: "gear" | "planning") => void;
+	active: "gear" | "planning";
+	onChange: (tab: "gear" | "planning") => void;
 }
 
 const tabs = [
-  { key: "gear" as const, label: "My Gear" },
-  { key: "planning" as const, label: "Planning" },
+	{ key: "gear" as const, label: "My Gear" },
+	{ key: "planning" as const, label: "Planning" },
 ];
 
 export function ThreadTabs({ active, onChange }: ThreadTabsProps) {
-  return (
-    <div className="flex border-b border-gray-200">
-      {tabs.map((tab) => (
-        <button
-          key={tab.key}
-          type="button"
-          onClick={() => onChange(tab.key)}
-          className={`px-4 py-2.5 text-sm font-medium transition-colors relative ${
-            active === tab.key
-              ? "text-blue-600"
-              : "text-gray-500 hover:text-gray-700"
-          }`}
-        >
-          {tab.label}
-          {active === tab.key && (
-            <span className="absolute bottom-0 left-0 right-0 h-0.5 bg-blue-600 rounded-t" />
-          )}
-        </button>
-      ))}
-    </div>
-  );
+	return (
+		<div className="flex border-b border-gray-200">
+			{tabs.map((tab) => (
+				<button
+					key={tab.key}
+					type="button"
+					onClick={() => onChange(tab.key)}
+					className={`px-4 py-2.5 text-sm font-medium transition-colors relative ${
+						active === tab.key
+							? "text-blue-600"
+							: "text-gray-500 hover:text-gray-700"
+					}`}
+				>
+					{tab.label}
+					{active === tab.key && (
+						<span className="absolute bottom-0 left-0 right-0 h-0.5 bg-blue-600 rounded-t" />
+					)}
+				</button>
+			))}
+		</div>
+	);
 }